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there is a Control Module that Controls the heating & AC.Like on a 93 Buick if it goes bad the same thing will happen.Only other thing 2 do is unplug the Fan or pull the AC fuse or get another module.The fan will continue 2 run UNTILL the battery is dead.

If you pull the fuse it will stop the fan if the short is before the fuse. But it should realy go to a shop

Replace the relay. It should be attached to the evaporator case right above the blower motor.

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โˆ™ 2015-07-16 19:22:07
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Q: How do you stop a new heater fan from running in a 1992 Buick LeSabre Limited even when the key is not in the ignition?
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